[FOSS-GPS] Short moving baseline implementation

[Danny Miller]

Well you'll need an accurate heading IMU, that knows compass direction.  
Almost all UAVs need them anyhow.

The RTKLib math itself, I don't know if an STM32F4 can run it.  A 
Raspberry Pi or BeagleBone could, though.  Once you have a solution- 
coordinates- then the STM32F4 can certainly handle it. It's possible for 
the UAV's GPS to xmit the RAW data down to the base for calculation and 
then the base give the "short answer" of coordinates up to the UAV.

You need a lot of bandwidth to transmit all the satellite data at 5Hz, 
but this is equally true if the base station sends its data one-way to 
the UAV for calculation onboard the UAV.

WHEN you've got coordinates, the angle is not difficult to calculate.  
STM32F4 can do many floating-point tangent() calculations a second, 5Hz 
should not be a problem, although they're much much slower than integer 
math.  There's a number of much faster integer math ops to get a 
less-accurate tangent(), but the accuracy may still be acceptable for 
your system.

Danny

On 11/4/2014 1:40 PM, MarekM wrote:
> Hello All,
> I wish to use RTK short (approx 2 meters) moving baseline to calculate
> heading angle.
> This is a part of aerial orthophotography camera stabilisation - yaw
> compensation,
> My plan is to use 2 pcs of uBlox LEA-6T modules and STM32F4 microprocessor.
> The questions are: what is minimum set of algoritms/modules to calculate
> angle between two moving antennas? Refrsh rate is 5 Hz - how about necessary
> memory and processing power?
>
>
>
>
>
> --
> View this message in context: http://open-source-gps-related-discussion-and-support.1099874.n2.nabble.com/Short-moving-baseline-implementation-tp7573069.html
> Sent from the Open Source GPS-related discussion and support mailing list archive at Nabble.com.
> _______________________________________________
> This message is sent to you from FOSS-GPS at lists.osgeo.org mailing list.
> Visit http://lists.osgeo.org/mailman/listinfo/foss-gps to manage your subscription
> For more information, check http://wiki.osgeo.org/wiki/FOSS-GPS
>